Patent GB-190816999-A (GB)
Title: Improvements in or relating to Date and Time Printing Devices.
Inventor: BOULT ALFRED JULIUS
Filed: 1908-08-12
Granted: 1909-11-12
Abstract: 16,999. Boult, A. J., [Stromberg Electric Manufacturing Co.]. Aug. 12. Date and time printing stamps.-In a date and time printing stamp, all the printing-wheels are driven from the first one through locked movements, and the first printing-wheel is actuated at intervals by a removable electro-magnet 22 in the pivoted arm 6, through an arm 41 carrying a pawl 42 engaging with a ratchet-wheel 44. In its normal position as shown in Fig. 1, the pawl 42 locks the ratchet-wheel 44 against forward movement. A clutch is interposed between the ratchet wheel 44 and the first printing-wheel which is disengaged for setting the printing-wheels. The month and year wheels are hand-set. The meridian wheel 51, the hour wheel 52, the tens minute wheel 53, and the minute wheel 54 are all mounted on independent bushes with their driving and locking wheels, on a shaft 55, and are driven from each other successively through mechanism of the geneva-stop type, having some wheels on the countershaft 75. The day wheel 50 is larger than the other wheels, and is mounted on a separate shaft between the frames 29, 30. It is driven from the meridian wheel through locking and drivirg wheels of identical type to these between the above mentioned printing - wheels. The year wheel 48 and month wheel 49 are set by hand through the shafts 93, 97 and locking geneva-stop devices 92, 96 respectively. On the same sleeve as the minute wheel 54 is the gear-wheel 60 engaging with a gearwheel 61 loose on the shaft 62, but attached to a wheel 63 gearing with a train of wheels that move clock hands on a dial 98 in unison with the movement of the printing-wheels. On the shaft 62, fixed to the ratchet-wheel 44, is a disk 67 having holes into one of which a pin projecting from the wheel 61 normally engages, thus connecting up the time devices with the operating- devices. When however a k y is inserted to turn a shaft 71, Fig. 1, in the clock train, it operates a lever which slides the wheel 61 in the direction of the arrow, against the force of a spring on the shaft 62, and thereby disengages the wheel 61 and disk 67, so that the type wheels may be set. An electric current for operating the stamp is periodically conveyed from a suitable clock to binding- posts 17, and thence through insulated conductors 8, 13 pivoted together between the main pivots 5, to the electro-magnet 22, which is removably fastened by a screw 25<a> to the pivoted arm 6 carrying the printing-head. The electro-magnet 22 attracts an armature 33 and thereby lifts the lever 41 against the force of a spring 48. On the return movement of the lever 41, the pawl 42 moves the wheel 44 one tooth and then contacts with a stop 47, which locks it against the ratchetwheel and prevents the latter from overrunning or moving forwards, while a pawl 46 locks the wheel for a backward movement. A separately pivoted casing 116, clamped to the arm by the bolt 105, allows of the ready removal or inspect:on of the electrical parts in the arm, and also engages with a spring 118 to hold the arm in its upper position against a removable stop-pin 119. An inking- ribbon with any suitable carrying and reversing mechanism is passe d across the face of the printing- wheels.